diff --git a/src/agent/tools/tool_rag.py b/src/agent/tools/tool_rag.py
index affac4a..9fee23b 100644
--- a/src/agent/tools/tool_rag.py
+++ b/src/agent/tools/tool_rag.py
@@ -82,8 +82,8 @@ def rerank_documents(query: str, documents: List[str]) -> List[float]:
 # ---------- 文本分块 ----------
 def split_into_chunks(text: str) -> List[str]:
     splitter = RecursiveCharacterTextSplitter(
-        chunk_size=CHUNK_SIZE,
-        chunk_overlap=CHUNK_OVERLAP,
+        chunk_size=RAG_CHUNK_SIZE,
+        chunk_overlap=RAG_CHUNK_OVERLAP,
         separators=["\n\n", "\n", " ", ""]
     )
     return splitter.split_text(text)
@@ -370,4 +370,3 @@ class RAGTool(BaseTool):
     async def _arun(self, **kwargs):
         # 直接调用同步版本
         return self._run(**kwargs)
-        
\ No newline at end of file